Lamellar carriage spring



Sept. 4, 1923.

R. BURGER-WEBER LAMELLAR CARRIAGE SPRING Filed OCT.. 2l. 1922 Fly. j.

Patented Sept. d, H23.

normar BURGER-wanna, or BURG, swrrznan LELLAB CARRIAGE SPRING.

i ,I Application led October 21, 1922. Serial No. 596,159.

To all whom it'may concern.'

Be it known that I, ROBERT BURGER- lVnBnn, a citizen ofthe Republic ofSwit in consequence of' certain weather'conditions, for instance throughhumidity, they oxidize in a comparative y short time once the greaseapplied to the lamellar leafsprings has dried up. The resultingincreased friction between the separate leafsprings is prejiudicial to aproper play of the carriage-spring, so that the shocks imparted to thecarriage when in movement, instead of being absorbed by the spring, arenecessarily taken up by the carriage trame and thus lvery often causebreakages in the spring. If, therefore, the latter is not frequentlytaken to pieces and cleaned and greased, damage to the carriage andconse'- quent accidents are sooner or later likely. However, theperiodical dismounting of the springs not only places the automobile orother carriage out of temporary use, but

such dismounting is mostly diiicult and causes much waste of time, forwhich very reasons these labours are as often as not neglected. It haspreviously been proposed, it is true, to overcome these drawbacks bymeans of lubricating devices arranged laterally of the carriage-springsand causing the oil or other lubricating means to be forced between theseparate leaf-springs. Such devices, however, are totally insufficient,inas much as the lubricating means is more likely to be pressed out atthe sides of than `into and between thi@ leaf-springs.

The present invention has for its object to avoid all'the aforementioneddisadvantages, the improved carriage-spring comprisinto the grooves andbetween the separateV leaf-springs.

In the accompanying drawings: Figs. 1 and 2 show alongitudinal and across section, respectively, of the carriagespring according to a firstconstruction, .and

modified construction.

Similar parts are designated ,by like references throughout the severalviews and in the specilication. Referring to Figs. l and 2, thecarriage- Figs. 3 and 4 show sectional4 views of a spring comprisessevenleaf-springs l, 2, 3,

4, 5, 6 and 7, of which the lower ones, as usual, are shorter than thoseabove. These leaf springs are held together in the known manner bya'clamp or the like (not illustrated), and secured against displacement,relative one to the other, bya centrally disposed bolt 8 which extendsthrough the whole set of the leaf-springs. rlhis boltl is provided,firstly, with a bore 9 which is closed at the bottom but open at thetop; secondly, with a lubricator such as, for instance, a grease-box 13of which only the lower part is indicated; and thirdly, with slots 10which correspond approximately with the cross section of the groovesinthe leaf-springs 2, 4 and 6. The

latter have longitudinal grooves 11 therein, these grooves graduallydiminishing towards each of the ends of the leaf-spring and forming withlthe base of the above 1ying leaf-spring a channel which communicateswith the slots l0 and therefore with the bore 9 of the bolt 8.

lf lubricating means is forced into the bore of the said bolt, it ismade to pass through the slots 10 into the channels 11,'

then over the well rounded-off edges of the same in order finally to bepressed between the separate leaf-springs, which, to facilitate thepenetration of the oil or other grease,`

may be formed with lateral or oblique smaller grooves. @wing to thefriction of the adjacent leaf-springs, caused by the play of the wholecarriage-spring during the movement of the carriage, the lubricatinggrease is enabled to reach even those places which, by the mere pressureunder which the grease is forced into the channels, would otherwise beinaccessible. In this way a thorough lubrication of the adjacent facesof the leafsprings is eiiected, and a lasting of thecarriage-spring madepossible. The play thereof will not be alected but remains even, al-

ways provided, that the lubrication is not neglected and renewed atregular intervals. Since the leaf-springs 2, 4, and 6 are weakened bythe grooves 11, it will be of advantage to neutralize the weakenin bmaking these leaf-springs somewhat t ic er than those without grooves.The grooves 11 may also, if desired, contain linings, and the lattermade to receive and distrlbute the lubricating means.

The modification shown in Figs. 3 and 4 is distinguished from thedevicehereinbefore described merely by a different construction of the boltreceiving the lubricant. The bolt 8a according to this modification,instead of having a central bore, now has two op ositely arrangedgrooves 12, which at t e t0 communicate with the bore o f an integrascrew-threaded part 9a adapted to receive the grease-box 13. The purposeof this con-l struction of the bolt 8El is to minimize as far aspossible its weakening, the size of the bolt, relative to that of thespring, being of course limted. v A

In place of the grooves described and shown channels of other form couldbe provided in the leaf-springs. By the application of my improvedcarriage-spring, especially on automobiles, the latter are preservedvthe grooves.

to the utmost, the carriage-spring absorbing easily all the shocks andthus Warranting a vided with a longitudinally disposed groove,

of a bolt mounted centrally of the leafsprings and extendingtherethrough, the said bolt having a bore and slots communicating withthe corresponding .grooves in the leafsprings, and means to cause alubricant to be pressed through the said bore and slots into thegrooves.

In the herein-described lamellar carriage-spring, the combination, witha series of leaf-springs of which every other one is thicker than theadjacent leaf-spring and provided with a longitudinally disposed groovediminishing towards either end, of a bolt mounted centrally of andextending through the leaf-springs, the said bolt having a central boreand lateral slots to communicatewith the grooves in the leafsprings, andmeans to cause a lubricant to be pressed through the said bore and slotsinto ROB. BURGER-WEBER.

